Ironclad electromagnet with pivoted armature



Jan, 10, 1950 o. EfRosAENf IRONCLAD ELECTROMAGNET WITH PIVOTED ARMATURE 2 Shee'ts-Sheet 1 Filed April 25, 1946 PIE: 1:,

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Jan. 10, 1950 o. E. ROSAEN 2,494,491

IRONCLAD ELECTROMAGNET WITH PIVOTED ARMATURE Filed April 25, 1946 2 Sheets-Sheet 2 JNVENTOR. Oscar 1F. Rogue/7 Patented Jan. 10, 1950 IRON-GLAD .ELECTROMAGNET WITH PIVOTED ARMATURE Oscar E. Rosaen, Detroit, Mich assignor to The Lodge and Shipley Company, Cincinnati, Ohio, a corporation of Ohio Application April 25, 194.6, 'Scrial'No. 664,902

3 Claims. 1

The present invention relates to valve actuating means and specifically to means for actuating the valve controlling the direction of rotation of a reversible hydraulic motor.

In U. S. Letters Patent No. 2,138,208, issued November 29, 1938, to the present inventor for Duplicating machine, there is shown a cutting machine in which movement of a cutting tool toward and from the work is accomplished by means of a reversible hydraulic motor, the direction and speed of which is controlled by a solenoid operated valve in turn controlled by the effect of a pattern on a tracer.

In the patented machine, the valve is moved in one direction or the other by alternately energizing two solenoids, the circuits therethrough being made and broken by the tracer.

lhe present invention has among its objects the improvement of the solenoid operating means for the valve.

Another object is solenoid valve operating means which is quiet in operation.

Still another object is to provide for more sensitive and smoother operation.

Other objects and advantages will be apparent to those skilled in the art upon reference to the following description and the accompanying drawings in which Fig. 1 is a view in elevation of the solenoid and .valve with parts in section.

Fig. 2 is a section on line 2-2 of Fig. .1.

Fig. 3 is a section on line 3-3 of Fig. 1.

Fig. 4 is a section on line 4-4 of Fig. 2.

Fig. 5 is a section on line 5-5 of Fig. 3.

Fig. 6 is a part section on line 6-4; of Fig. 5

Fig. 'l is a section on line 'l--'| of Fig. 1.

In the drawings, the valve is shown at and comprises a housing member provided with a vertical bore having slidable therein the valve member 2|. three annular chambers 22A, 22B and 22C of which chamber 22A is connected to one side of the reversible motor (not shown) by conduit 23A, chamber 220 is connected to the other side of the motor by conduit 23C and to chamber 223 is connected the fluid conduit 24.

The valve 2| consists of a spool shaped member having spaced flanges ZIA and ZIB at each end and axially bored as at 25 from the lower end with a plurality of small passages 25A furnishing communication between the bore and the spaces between the flanges at the ends.'

The flanges ZIA at the extreme ends of the valve member serve only as guide flanges, the

flanges 2IB serving as valve members for the Communicating with the bore are 2 short passages from the main bore to chambers 22A and 220.

These flanges ZlB are of slightly less width than said short passages and when the member 2i is in centered or neutral position, allow fluid to flow from the conduit 24 into the central valve chamber 22B between the flanges and into and out of the chambers 22A and 22C to the spaces 2ID between the end flanges, then out of the bore 25. Under such conditions, the pressure in chambers 22A and 220 will be equal and the motor will not be actuated. When, however, the member 2! is moved in either direction, the flow into chambers 22A and 22C will be unbalanced. For example, if the valve is moved upward, the fluid will be permitted to enter chamber 22A but cut off from 220. However, fluid returning from the motor to chamber 220 will flow to the lower space ZID and out through bore 25.

Valve member 2| is as shown actuable by a link connected at its upper end to a crank arm 31 fixed to the shaft 32 of a rotatable 0r swingable armature 33 arranged to swing below but closely adjacent to the pole ends of the cores 34 w of a pair of solenoids 35.

-structure.

Looking at Fig. 2, it will be seen that the cores 34 are in axial alignment and that they are beveled as at 34A with the bevels overlapping to provide a vertical gap extending in a direction oblique to the core axis.

The armature 33 is shown as a cylindrical member or bar mounted on or integral with shaft 32 and having one end 33A arcuate about the axis of the shaft while the other end is also arcuate about the axis on the same radius, but is also beveled on both sides as at 33B at an angle to the shaft axis so as to present a narrow curved flat surface 330 at the same oblique angle as that of the gap 40, and adapted when the armature is centered, to lie opposite the gap.

Further, in order to offer as little resistance as possible to the flux, the undersides of the cores are cut away as shown at M to present a surface arcuate about the axis of shaft 32 on a radius as little as possible greater than the radius of armature surfaces 33A and 33C, as will permit movement of the armature without touching. And, for the same reason, a similar arcuate recess 42 is provided in the base plate 38.

In order to center the armature 33 when neither solenoid 35 is energized, the crank 3| is provided with a relatively long rigid arm 3IA to the end of which is fixed a suitable spring 50. This is preferably a helical spring as shown and is so mounted as to be adjustable in position.

A suitable mounting for the spring 50 consists of a split block 5| fixed to for example the frame member 31 by means of a screw 52 which also serves to press together the split block with the spring between the part, suitable grooves for the spring being provided.

In the drawings, the lead wires 60 to the solenoids 35 are shown as passing up through frame member 31 to a suitable socket 6! into which may be inserted a suitable plug (not shown) to which are connected the several current leads to and from the tracer and source of current supply.

I claim:

1. Valve operating means comprising an elongated rectangular frame of magnetic material, a pair of core members secured to the inner faces of the end members of said frame and extending coaxially towards each other, solenoids on said cores adapted to be separately energized with electric current, the free ends of said cores having spaced parallel oblique faces forming an air gap disposed obliquely to the longitudinal axes of said cores, an elongated armature rotatably mounted in said frame, the longitudinal axes of said cores being in the plane of rotation of said armature, one end of said armature being adjacent said oblique air gap, the adjacent surfaces of said cores and armature being arcuate and concentric about the axis of rotation of said armature, the arcuate end of said armature being beveled on opposite sides to form at said end an edge disposed at substantially the same oblique angle as said air gap when the armature is centered, the opposite end of said armature being disposed in close proximity to a portion of said frame, and means urging said armature to its centered position, said armature turning on its axis in one direction or the other in response to energization of one or the other of said solenoids.

2. A valve actuating mechanism comprising a rectangular frame of magnetic material, a pair of coaxial core members within said frame and secured to the respective end members thereof, the adjacent ends of said core members being separated by an air gap, a bar armature within said frame, said bar having one end thereof adjacent said air gap and being pivotally mounted on said frame to rotate in a plane perpendicular to and containing the longitudinal axes of said cores, the ends of said cores having spaced flat tapered matching faces disposed at an angle to the axes of said cores providing an air gap therebetween the surfaces of said core ends adjacent the end of said armature being arcuate and concentric with the axis of rotation of said armature, the tip of the armature adjacent said air gap being tapered to an edge disposed at an angle substantially coincident with the angle of said air gap when in a position substantially perpendicular to said cores, the width of the edge of said armature being substantially equal to the width of said air gap, the coil windings on said cores, said armature turning in one direction or the other in response to energization of one or the other of said coil windings and adapted to be operatively connected to a valve to actuate the same.

3. A valve actuator comprising a rectangular frame of magnetic material, cores mounted within said frame with their longitudinal axes in alignment, the adjacent ends of said cores being beveled to provide spaced parallel faces forming between them an air gap that is oblique to the longitudinal axes of said cores, a cylindrical armature having an arcuate end provided with beveled surfaces on its opposite sides forming an arcuate edge at said end, said armature being rotatably mounted in said frame and having its arcuate edge opposite and in the same plane as the oblique air gap when the armature is centered, said armature being adapted for operative connection to a valve, said core ends having arcuate surfaces concentric with the arcuate end of said armature providing an air gap of uniform width between said core ends and the arcuate end of said armature, coil windings on said cores adapted to be alternately energized, and means urging said armature to its centered position.

OSCAR E. ROSAEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 422,512 Eickemeyer Mar. 4, 1890 1,161,819 Grob Nov. 23, 1915 1,683,450 Crockett Sept. 4, 1928 1,701,319 Baltzley Feb. 5, 1929 2,121,392 Ashworth June 21, 1938 2,311,069 Miller Feb. 16, 1943 FOREIGN PATENTS Number Country Date 383,879 Great Britain Nov. 24, 1932 630,970 Germany May 20, 1936 OTHER REFERENCES $81. No. 290,306, Eichhorn (A. P. 0.), pub. May 18, 1943. 

